Gpx

<!--
  示例：加载 GPX 轨迹
  说明：一份内嵌 GPX 包含一段轨迹与一个航点，加载后轨迹贴地显示
  核心逻辑：GpxDataSource.load(data URL) → 轨迹转折线 → 航点转点
  依赖：CesiumJS 1.121 · jsDelivr CDN
-->
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta name="robots" content="noindex,follow">
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>加载 GPX 轨迹</title>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/cesium@1.121.0/Build/Cesium/Widgets/widgets.css">
<style>
  html,body{height:100%;margin:0}
  body{background:#0e1116;color:#e6e8ec;overflow:hidden;
       font:13px/1.6 -apple-system,"Segoe UI","PingFang SC",sans-serif}
  #c{height:100%}
  .tip{position:absolute;left:12px;top:12px;z-index:5;
       background:rgba(23,28,35,.9);border:1px solid #2a313b;border-radius:6px;
       padding:8px 12px;font-size:12px;color:#a2a9b6;max-width:320px;line-height:1.6}

  .cesium-viewer-bottom .cesium-widget-credits,.cesium-viewer-animationContainer,
  .cesium-viewer-timelineContainer{display:none!important}
</style>
</head>
<body>
<div id="c"></div>
<div class="tip">轨迹是带时间的折线，航点单独成为标注，两者都来自同一份 GPX。</div>
<script src="https://cdn.jsdelivr.net/npm/cesium@1.121.0/Build/Cesium/Cesium.js"></script>
<script>
(function () {
  'use strict';

  var viewer = new Cesium.Viewer('c', {
    baseLayer: false,
    baseLayerPicker: false, geocoder: false, homeButton: false,
    sceneModePicker: false, navigationHelpButton: false,
    animation: false, timeline: false, fullscreenButton: false,
    infoBox: false, selectionIndicator: false
  });

  var scene = viewer.scene;
  scene.globe.baseColor = Cesium.Color.fromCssColorString('#1c2733');
  scene.backgroundColor = Cesium.Color.fromCssColorString('#0e1116');
  scene.skyBox.show = false;
  scene.sun.show = false;
  scene.moon.show = false;
  if (scene.skyAtmosphere) scene.skyAtmosphere.show = false;

  var pts = [];
  for (var i = 0; i < 24; i++) {
    var lon = 116.3850 + i * 0.00040 + Math.sin(i * 0.6) * 0.00018;
    var lat = 39.9015 + i * 0.00013 + Math.cos(i * 0.5) * 0.00016;
    var ele = 40 + Math.sin(i * 0.4) * 8;
    pts.push('<trkpt lat="' + lat.toFixed(6) + '" lon="' + lon.toFixed(6) + '">' +
      '<ele>' + ele.toFixed(1) + '</ele></trkpt>');
  }

  var gpx = [
    '<?xml version="1.0" encoding="UTF-8"?>',
    '<gpx version="1.1" creator="demo" xmlns="http://www.topografix.com/GPX/1/1">',
    '<wpt lat="39.9042" lon="116.3930"><name>补给点</name></wpt>',
    '<trk><name>示例轨迹</name><trkseg>',
    pts.join(''),
    '</trkseg></trk>',
    '</gpx>'
  ].join('');

  var dataUrl = 'data:application/gpx+xml;charset=utf-8,' + encodeURIComponent(gpx);

  var ds = viewer.dataSources.add(Cesium.GpxDataSource.load(dataUrl));
  ds.then(function (dataSource) {
    viewer.zoomTo(dataSource, new Cesium.HeadingPitchRange(
      Cesium.Math.toRadians(10), Cesium.Math.toRadians(-32), 420
    ));
  });
  /* 相机在数据加载完成后由 zoomTo 设置 */
})();
</script>
</body>
</html>